THE ORIGIN OF [O II] IN POST-STARBURST AND RED-SEQUENCE GALAXIES IN HIGH-REDSHIFT CLUSTERS

Lemaux, B C; Lubin, L M; Kocevski, D; Shapley, A; Gal, R R

doi:10.1088/0004-637X/716/2/970

Title: THE ORIGIN OF [O II] IN POST-STARBURST AND RED-SEQUENCE GALAXIES IN HIGH-REDSHIFT CLUSTERS

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Abstract

We present the first results from a near-IR spectroscopic campaign of the Cl1604 supercluster at z {approx} 0.9 and the cluster RX J1821.6+6827 at z {approx} 0.82 to investigate the nature of [O II] {lambda}3727 emission in cluster galaxies at high redshift. Of the 401 members in Cl1604 and RX J1821+6827 confirmed using the Keck II/DEIMOS spectrograph, 131 galaxies have detectable [O II] emission with no other signs of current star formation activity, as well as strong absorption features indicative of a well-established older stellar population. The combination of these features suggests that the primary source of [O II] emission in these galaxies is not a result of star formation processes, but rather due to the presence of a low-ionization nuclear emission-line region (LINER) or Seyfert component. Using the NIRSPEC spectrograph on the Keck II 10 m telescope, 19 such galaxies were targeted, as well as 6 additional [O II]-emitting cluster members that exhibited signs of ongoing star formation activity. Nearly half ({approx}47%) of the 19 [O II]-emitting, absorption-line-dominated galaxies exhibit [O II] to H{alpha} equivalent width (EW) ratios higher than unity, the typical observed value for star-forming galaxies, with an EW distribution similar to that observed for LINERs atmore »« less

Authors:

Lemaux, B C; Lubin, L M; Kocevski, D ^[1]; Shapley, A ^[2]; Gal, R R ^[3]

Department of Physics, University of California, Davis, 1 Shields Avenue, Davis, CA 95616 (United States)
Also at Department of Physics and Astronomy, 430 Portola Plaza, University of California, Los Angeles, CA 90095-1547, USA. (United States)
Also at University of Hawaii, Institute for Astronomy, 2680 Woodlawn Drive, Honolulu, HI 96822 (United States)

Publication Date:: Sun Jun 20 00:00:00 EDT 2010

OSTI Identifier:: 21452951

Resource Type:: Journal Article

Journal Name:: Astrophysical Journal

Additional Journal Information:: Journal Volume: 716; Journal Issue: 2; Other Information: DOI: 10.1088/0004-637X/716/2/970; Journal ID: ISSN 0004-637X

Country of Publication:: United States

Language:: English

Subject:: 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ABSORPTION; EMISSION; GALACTIC EVOLUTION; GALAXY CLUSTERS; IONIZATION; RED SHIFT; SEYFERT GALAXIES; STARS; TELESCOPES; EVOLUTION; GALAXIES; SORPTION

Citation Formats


                    Lemaux, B C, Lubin, L M, Kocevski, D, Shapley, A, Gal, R R, and Squires, G. K., E-mail: lemaux@physics.ucdavis.ed. THE ORIGIN OF [O II] IN POST-STARBURST AND RED-SEQUENCE GALAXIES IN HIGH-REDSHIFT CLUSTERS.  United States: N. p., 2010. 
        Web.  doi:10.1088/0004-637X/716/2/970.

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                    Lemaux, B C, Lubin, L M, Kocevski, D, Shapley, A, Gal, R R, & Squires, G. K., E-mail: lemaux@physics.ucdavis.ed. THE ORIGIN OF [O II] IN POST-STARBURST AND RED-SEQUENCE GALAXIES IN HIGH-REDSHIFT CLUSTERS.  United States.  https://doi.org/10.1088/0004-637X/716/2/970

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                    Lemaux, B C, Lubin, L M, Kocevski, D, Shapley, A, Gal, R R, and Squires, G. K., E-mail: lemaux@physics.ucdavis.ed. 2010.  
        "THE ORIGIN OF [O II] IN POST-STARBURST AND RED-SEQUENCE GALAXIES IN HIGH-REDSHIFT CLUSTERS".  United States.  https://doi.org/10.1088/0004-637X/716/2/970.

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@article{osti_21452951,

  title        = {THE ORIGIN OF [O II] IN POST-STARBURST AND RED-SEQUENCE GALAXIES IN HIGH-REDSHIFT CLUSTERS},

  author       = {Lemaux, B C and Lubin, L M and Kocevski, D and Shapley, A and Gal, R R and Squires, G. K., E-mail: lemaux@physics.ucdavis.ed},

  abstractNote = {We present the first results from a near-IR spectroscopic campaign of the Cl1604 supercluster at z {approx} 0.9 and the cluster RX J1821.6+6827 at z {approx} 0.82 to investigate the nature of [O II] {lambda}3727 emission in cluster galaxies at high redshift. Of the 401 members in Cl1604 and RX J1821+6827 confirmed using the Keck II/DEIMOS spectrograph, 131 galaxies have detectable [O II] emission with no other signs of current star formation activity, as well as strong absorption features indicative of a well-established older stellar population. The combination of these features suggests that the primary source of [O II] emission in these galaxies is not a result of star formation processes, but rather due to the presence of a low-ionization nuclear emission-line region (LINER) or Seyfert component. Using the NIRSPEC spectrograph on the Keck II 10 m telescope, 19 such galaxies were targeted, as well as 6 additional [O II]-emitting cluster members that exhibited signs of ongoing star formation activity. Nearly half ({approx}47%) of the 19 [O II]-emitting, absorption-line-dominated galaxies exhibit [O II] to H{alpha} equivalent width (EW) ratios higher than unity, the typical observed value for star-forming galaxies, with an EW distribution similar to that observed for LINERs at low redshift. A majority ({approx}68%) of these 19 galaxies are classified as LINER/Seyfert based primarily on the emission-line ratio of [N II] {lambda}6584 and H{alpha}. The fraction of LINER/Seyferts increases to {approx}85% for red [O II]-emitting, absorption-line-dominated galaxies. The LINER/Seyfert galaxies in our Cl1604 sample exhibit average L([O II])/L(H{alpha}) ratios that are significantly higher than that observed in populations of star-forming galaxies, suggesting that [O II] is a poor indicator of star formation in a significant fraction of high-redshift cluster members. From the prevalence of [O II]-emitting, absorption-line-dominated galaxies in both systems and the fraction of such galaxies that are classified as LINER/Seyfert, we estimate that at least {approx}20% of galaxies in high-redshift clusters with M{sub *}>10{sup 10}-10{sup 10.5} M{sub sun} contain a LINER/Seyfert component that can be revealed with line ratios. We also investigate the effect such a population has on the global star formation rate of cluster galaxies and the post-starburst fraction, concluding that LINER/Seyferts must be accounted for if these quantities are to be physically meaningful.},

  doi          = {10.1088/0004-637X/716/2/970},

  url          = {https://www.osti.gov/biblio/21452951},
  journal      = {Astrophysical Journal},

  issn         = {0004-637X},

  number       = 2,

  volume       = 716,

  place        = {United States},

  year         = {Sun Jun 20 00:00:00 EDT 2010},

  month        = {Sun Jun 20 00:00:00 EDT 2010}

}

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